Optical imaging lens

ABSTRACT

Present embodiments relate to an optical imaging lens. The optical imaging lens may include a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element positioned sequentially from an object side to an image side. Through arrangement of convex or concave surfaces of the five lens elements, the length of the optical imaging lens may be shortened while providing improved optical characteristics and imaging quality.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of continuation of U.S. patentapplication Ser. No. 16/739,368, filed on Jan. 10, 2020, which is acontinuation of U.S. patent application Ser. No. 15/586,212, filed onMay 3, 2017, which is herein incorporated by reference and claims thebenefit of Chinese Patent Application No. 201710182451.5 filed on Mar.24, 2017.

TECHNICAL FIELD

The present disclosure relates to an optical imaging lens, andparticularly, to an optical imaging lens having five lens elements.

BACKGROUND

Technology for mobile electronic devices is improving constantly.Further, key components of mobile electronic devices such as opticalimaging lens are updated frequently. As a result, applications of mobileelectronic devices are no longer limited to taking pictures or videos.To satisfy consumer demands and perform various optical applications,mobile electronic devices may utilize a telephoto lens to achieve alarger field of view. As the focal length of the mobile electronicdevice is lengthened, the amplification factor of the optical zoom ofthe mobile electronic device increases.

However, the focal length of the lens is inversely proportional to anamount of lights entering the lens. Further, the effective radius andthe volume of the lens are increased when the size of the aperture isincreased. Therefore, it may be desirable to increase the focal lengthto about 8 mm or more than about 8 mm, and to increase the size of theaperture and the amount of light (Fno is less than 2.6) withoutaffecting the lens volume (the effective radius is less than about 2.5mm).

SUMMARY

The present disclosure relates to an optical imaging lens. By designingconvex and/or concave surfaces of lens elements, the length of theoptical imaging lens may be shortened while still maintaining goodoptical characteristics and imaging quality.

In the present disclosure, parameters used herein may be chosen from butnot limited to parameters listed below:

Parameter Definition T1 A central thickness of a first lens elementalong an optical axis G12 An air gap between a first lens element and asecond lens element along an optical axis T2 A central thickness of asecond lens element along an optical axis G23 An air gap between asecond lens element and a third lens element along an optical axis T3 Acentral thickness of a third lens element along an optical axis G34 Anair gap between a third lens element and a fourth lens element along anoptical axis T4 A central thickness of a fourth lens element along anoptical axis G45 An air gap between a fourth lens element and a fifthlens element along a optical axis T5 A central thickness of a fifth lenselement along an optical axis G5F An air gap between a fifth lenselement and a filtering unit along an optical axis TF A centralthickness of a filtering unit along an optical axis GFP An air gapbetween a filtering unit and an image plane along an optical axis f1 Afocusing length of a first lens element f2 A focusing length of a secondlens element f3 A focusing length of a third lens element f4 A focusinglength of a fourth lens element f5 A focusing length of a fifth lenselement n1 A refracting index of a first lens element n2 A refractingindex of a second lens element n3 A refracting index of a third lenselement n4 A refracting index of a fourth lens element n5 A refractingindex of a fifth lens element v1 An Abbe number of a first lens elementv2 An Abbe number of a second lens element v3 An Abbe number of a thirdlens element v4 An Abbe number of a fourth lens element v5 An Abbenumber of a fifth lens element HFOV Half Field of View of an opticalimaging lens Fno F-number of an optical imaging lens EFL An effectivefocal length of an optical imaging lens TTL A distance from anobject-side surface of a first lens element to an image plane along anoptical axis ALT A sum of a central thicknesses from a first lenselement to a fifth lens element AAG A sum of all air gaps from a firstlens element to a fifth lens element along an optical axis BFL A backfocal length of an optical imaging lens/A distance from an image-sidesurface of a fifth lens element to an image plane along an optical axisTL A distance from an object-side surface of a first lens element to animage-side surface of a fifth lens element along an optical axis

According to one embodiment of the present disclosure, an opticalimaging lens may comprise, sequentially from an object side to an imageside along an optical axis, first, second, third, fourth, and fifth lenselements. Each of the first, second, third, fourth, and fifth lenselements may have varying refracting power in some embodiments.Additionally, each of the first to fifth lens elements may comprise anobject-side surface facing toward the object side, an image-side surfacefacing toward the image side, and a central thickness defined along theoptical axis. Moreover, the image-side surface of the first lens elementcomprises a concave portion in a vicinity of the optical axis, theobject-side surface of the second lens element comprises a convexportion in a vicinity of a periphery of the second lens element, theimage-side surface of the second lens element comprises a concaveportion in a vicinity of a periphery of the second lens element, theobject-side surface of the fifth lens element comprises a convex portionin a vicinity of the optical axis, and the optical imaging lens furthersatisfies Inequality (2): (AAG+T5)/T1≤3.01, Inequality (1): AAG/T2≤4.71and Inequality (3): TTL/BFL≤3.61.

According to one embodiment of the present disclosure, an opticalimaging lens may comprise, sequentially from an object side to an imageside along an optical axis, first, second, third, fourth, and fifth lenselements. Each of the first to fifth lens elements may have varyingrefracting power in some embodiments. Additionally, each of the first,second, third, fourth, and fifth lens elements may comprise anobject-side surface facing toward the object side, an image-side surfacefacing toward the image side, and a central thickness defined along theoptical axis. Moreover, the image-side surface of the first lens elementcomprises a concave portion in a vicinity of the optical axis, thesecond lens element has negative refracting power, the object-sidesurface of the fifth lens element comprises a convex portion in avicinity of the optical axis, and the optical imaging lens furthersatisfies Inequalities (1), (2) and (3).

According to one embodiment of the present disclosure, an opticalimaging lens may comprise, sequentially from an object side to an imageside along an optical axis, first, second, third, fourth, and fifth lenselements. Each of the first to fifth lens elements may have varyingrefracting power in some embodiments. Additionally, each of the first,second, third, fourth, and fifth lens elements may comprise anobject-side surface facing toward the object side, an image-side surfacefacing toward the image side, and a central thickness defined along theoptical axis. Moreover, the image-side surface of the first lens elementcomprises a concave portion in a vicinity of the optical axis, theoptical imaging lens further satisfies Inequality (2) and Inequality(7): AAG/G23≤4, and all of the first, second, third, fourth, and fifthlens elements have an effective radius smaller than or equal to 2.5 mm.

Moreover, the above embodiments of the optical imaging lens may compriseno other lenses having refracting power beyond the five lens elementswhile these embodiments may satisfy any one of inequalities as follows:

TTL/ALT≤2.21 Inequality (4); ALT/(T1+T3+T4)≤1.8 Inequality (5);(T2+G23+G34+G45+T5)/T1≤3.3 Inequality (6); (AAG+T2)/T4≤8.51 Inequality(8); EFL/BFL≤4.2 Inequality (9); (G12+T2+G45+T5)/T1≤2.2 Inequality (10);(AAG+T5)/(T2+G23)≤4.2 Inequality (11); (T2+G23+G34+G45+T5)/T3≤6Inequality (12); AAG/T4≤7.2 Inequality (13); (AAG+T2)/T5≤4.6 Inequality(14); EFL/ALT≤2.4 Inequality (15); (G12+T2+G45+T5)/T3≤4.1 Inequality(16); and

v5≤35 Inequality (17).

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to the present disclosure;

FIG. 2 depicts a schematic view of the relation between the surfaceshape and the optical focus of the lens element;

FIG. 3 depicts a schematic view of a first example of the surface shapeand the effective radius of the lens element;

FIG. 4 depicts a schematic view of a second example of the surface shapeand the effective radius of the lens element;

FIG. 5 depicts a schematic view of a third example of the surface shapeand the effective radius of the lens element;

FIG. 6 depicts a cross-sectional view of a first embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 7 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a first embodiment of the opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of theoptical imaging lens of a first embodiment of the present disclosure;

FIG. 9 depicts a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of a second embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 11 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a second embodiment of the opticalimaging lens according the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of theoptical imaging lens of a second embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of a third embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 15 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a third embodiment of the opticalimaging lens according the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of a third embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of a fourth embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 19 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a fourth embodiment of the opticalimaging lens according the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of theoptical imaging lens of a fourth embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of a fifth embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 23 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a fifth embodiment of the opticalimaging lens according the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of a fifth embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of a sixth embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 27 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a sixth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of a sixthembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 29 depicts a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of a seventh embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 31 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a seventh embodiment of the opticalimaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of theoptical imaging lens of a seventh embodiment of the present disclosure;

FIG. 33 depicts a table of aspherical data of a seventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of an eighth embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 35 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of an eighth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of theoptical imaging lens of an eighth embodiment of the present disclosure;

FIG. 37 depicts a table of aspherical data of an eighth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 38 depicts a cross-sectional view of a ninth embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 39 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a ninth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of theoptical imaging lens of a ninth embodiment of the present disclosure;

FIG. 41 depicts a table of aspherical data of a ninth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 42 depicts a cross-sectional view of a tenth embodiment of anoptical imaging lens having seven lens elements according to the presentdisclosure;

FIG. 43 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a tenth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 44 depicts a table of optical data for each lens element of theoptical imaging lens of a tenth embodiment of the present disclosure;

FIG. 45 depicts a table of aspherical data of a tenth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 46 is a table for values of T1, G12, T2, G23, T3, G34, T4, G45, T5,G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3, (G12+T2+G45+T5)/T1, (G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2,AAG/G23, AAG/T4 of the all example embodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference may now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, althoughthey may, and various example embodiments may be readily combined andinterchanged without departing from the scope or spirit of the presentdisclosure. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the disclosure. In this respect, as used herein, theterm “in” may include “in” and “on”, and the terms “a”, “an” and “the”may include singular and plural references. Furthermore, as used herein,the term “by” may also mean “from”, depending on the context.Furthermore, as used herein, the term “if” may also mean “when” or“upon,” depending on the context. Furthermore, as used herein, the words“and/or” may refer to and encompass any and all possible combinations ofone or more of the associated listed items.

In the present disclosure, the description “a lens element havingpositive refracting power (or negative refracting power)” means that theparaxial refracting power of the lens element in Gaussian optics ispositive (or negative). The description “An object-side (or image-side)surface of a lens element” may include a specific region of that surfaceof the lens element where imaging rays are capable of passing throughthat region, namely the clear aperture of the surface. Theaforementioned imaging rays may be classified into two types, chief rayLc and marginal ray Lm. Taking a lens element depicted in FIG. 1 as anexample, the lens element may be rotationally symmetric, where theoptical axis I is the axis of symmetry. The region A of the lens elementis defined as “a part in a vicinity of the optical axis,” and the regionC of the lens element is defined as “a part in a vicinity of a peripheryof the lens element.” Besides, the lens element may also have anextending part E extended radially and outwardly from the region C,namely the part outside of the clear aperture of the lens element. Theextending part E may be used for physically assembling the lens elementinto an optical imaging lens system. Under normal circumstances, theimaging rays would not pass through the extending part E because thoseimaging rays only pass through the clear aperture. The structures andshapes of the aforementioned extending part E are only examples fortechnical explanation, the structures and shapes of lens elements shouldnot be limited to these examples. Note that the extending parts of thelens element surfaces depicted in the following embodiments arepartially omitted.

The following criteria are provided for determining the shapes and theparts of lens element surfaces set forth in the present disclosure.These criteria mainly determine the boundaries of parts under variouscircumstances including the part in a vicinity of the optical axis, thepart in a vicinity of a periphery of a lens element surface, and othertypes of lens element surfaces such as those having multiple parts.

FIG. 1 depicts a radial cross-sectional view of a lens element. Beforedetermining boundaries of those aforementioned portions, two referentialpoints should be defined first, the central point and the transitionpoint. The central point of a surface of a lens element may be a pointof intersection of that surface and the optical axis. The transitionpoint may be a point on a surface of a lens element, where the tangentline of that point is perpendicular to the optical axis. Additionally,if multiple transition points appear on one single surface, then thesetransition points are sequentially named along the radial direction ofthe surface with numbers starting from the first transition point. Forinstance, the first transition point (closest one to the optical axis),the second transition point, and the Nth transition point (farthest oneto the optical axis within the scope of the clear aperture of thesurface). The portion of a surface of the lens element between thecentral point and the first transition point is defined as the portionin a vicinity of the optical axis. The portion located radially outsideof the Nth transition point (but still within the scope of the clearaperture) is defined as the portion in a vicinity of a periphery of thelens element. In some embodiments, there are other portions existingbetween the portion in a vicinity of the optical axis and the portion ina vicinity of a periphery of the lens element; the numbers of portionsdepend on the numbers of the transition point(s). In addition, theradius of the clear aperture (or a so-called effective radius) of asurface may be defined as the radial distance from the optical axis I toa point of intersection of the marginal ray Lm and the surface of thelens element.

Referring to FIG. 2 , determining whether the shape of a portion isconvex or concave may depend on whether a collimated ray passing throughthat portion converges or diverges. That is, while applying a collimatedray to a portion to be determined in terms of shape, the collimated raypassing through that portion may be bended and the ray itself or itsextension line may eventually meet the optical axis. The shape of thatportion may be determined by whether the ray or its extension line meets(intersects) the optical axis (focal point) at the object-side orimage-side. For instance, if the ray itself intersects the optical axisat the image side of the lens element after passing through a portion,e.g., the focal point of this ray is at the image side (see point R inFIG. 2 ), the portion may be determined as having a convex shape. On thecontrary, if the ray diverges after passing through a portion, theextension line of the ray intersects the optical axis at the object sideof the lens element, e.g., the focal point of the ray is at the objectside (see point M in FIG. 2 ), that portion may be determined as havinga concave shape. Therefore, referring to FIG. 2 , the portion betweenthe central point and the first transition point may have a convexshape, the portion located radially outside of the first transitionpoint may have a concave shape, and the first transition point is thepoint where the portion having a convex shape changes to the portionhaving a concave shape, namely the border of two adjacent portions.Alternatively, there is another method to determine whether a portion ina vicinity of the optical axis may have a convex or concave shape byreferring to the sign of an “R” value, which is the (paraxial) radius ofcurvature of a lens surface. The R value may be used in conventionaloptical design software such as Zemax and CodeV. The R value may appearin the lens data sheet in the software. For an object-side surface,positive R may mean that the object-side surface is convex, and negativeR may mean that the object-side surface is concave. Conversely, for animage-side surface, positive R may mean that the image-side surface isconcave, and negative R may mean that the image-side surface is convex.The result found by using this method may be consistent with the resultfound using the other way mentioned above, which may determine surfaceshapes by referring to whether the focal point of a collimated ray is atthe object side or the image side.

For none transition point cases, the portion in a vicinity of theoptical axis may be defined as the portion between 0-50% of theeffective radius (radius of the clear aperture) of the surface, whereasthe portion in a vicinity of a periphery of the lens element may bedefined as the portion between 50-100% of effective radius (radius ofthe clear aperture) of the surface.

Referring to the first example depicted in FIG. 3 , only one transitionpoint, namely a first transition point, appears within the clearaperture of the image-side surface of the lens element. Portion I may bea portion in a vicinity of the optical axis, and portion II may be aportion in a vicinity of a periphery of the lens element. The portion ina vicinity of the optical axis may be determined as having a concavesurface due to the R value at the image-side surface of the lens elementis positive. The shape of the portion in a vicinity of a periphery ofthe lens element may be different from that of the radially inneradjacent portion, e.g., the shape of the portion in a vicinity of aperiphery of the lens element may be different from the shape of theportion in a vicinity of the optical axis; the portion in a vicinity ofa periphery of the lens element may have a convex shape.

Referring to the second example depicted in FIG. 4 , a first transitionpoint and a second transition point may exist on the object-side surface(within the clear aperture) of a lens element. Here, portion I may bethe portion in a vicinity of the optical axis, and portion III may bethe portion in a vicinity of a periphery of the lens element. Theportion in a vicinity of the optical axis may have a convex shapebecause the R value at the object-side surface of the lens element maybe positive. The portion in a vicinity of a periphery of the lenselement (portion III) may have a convex shape. What is more, there maybe another portion having a concave shape existing between the first andsecond transition point (portion II).

Referring to a third example depicted in FIG. 5 , no transition pointmay exist on the object-side surface of the lens element. In this case,the portion between 0-50% of the effective radius (radius of the clearaperture) may be determined as the portion in a vicinity of the opticalaxis, and the portion between 50-100% of the effective radius may bedetermined as the portion in a vicinity of a periphery of the lenselement. The portion in a vicinity of the optical axis of theobject-side surface of the lens element may be determined as having aconvex shape due to its positive R value, and the portion in a vicinityof a periphery of the lens element may be determined as having a convexshape as well.

Several exemplary embodiments and associated optical data will now beprovided to illustrate non-limiting examples of optical imaging lenssystems having good optical characteristics while increasing the fieldof view. Reference is now made to FIGS. 6-9 . FIG. 6 illustrates anexample cross-sectional view of an optical imaging lens 1 having fivelens elements according to a first example embodiment. FIG. 7 showsexample charts of longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 1 according to the firstexample embodiment. FIG. 8 illustrates an example table of optical dataof each lens element of the optical imaging lens 1 according to thefirst example embodiment. FIG. 9 depicts an example table of asphericaldata of the optical imaging lens 1 according to the first exampleembodiment.

As shown in FIG. 6 , the optical imaging lens 1 of the presentembodiment may comprise, in order from an object side A1 to an imageside A2 along an optical axis, a first lens element 110, a second lenselement 120, an aperture stop 100, a third lens element 130, a fourthlens element 140, and a fifth lens element 150. A filtering unit 160 andan image plane 170 of an image sensor (not shown) are positioned at theimage side A2 of the optical imaging lens 1. Each of the first, second,third, fourth, and fifth lens elements 110, 120, 130, 140, 150 and thefiltering unit 160 may comprise an object-side surface 111, 121, 131,141, 151, 161 facing toward the object side A1 and an image-side surface112, 122, 132, 142, 152,162 facing toward the image side A2. The exampleembodiment of the filtering unit 160 illustrated is an IR cut filter(infrared cut filter) positioned between the fifth lens element 150 andan image plane 170. The filtering unit 160 selectively may absorb lightpassing optical imaging lens 1 that has a specific wavelength. Forexample, if IR light is absorbed, IR light which is not seen by humaneyes may be prohibited from producing an image on the image plane 170.

Exemplary embodiments of each lens element of the optical imaging lens 1may now be described with reference to the drawings. The lens elementsof the optical imaging lens 1 may be constructed using plastic materialsin this embodiment.

An example embodiment of the first lens element 110 may have positiverefracting power. The object-side surface 111 may comprise a convexportion 1111 in a vicinity of an optical axis and a convex portion 1112in a vicinity of a periphery of the first lens element 110. Theimage-side surface 112 may comprise a concave portion 1121 in a vicinityof the optical axis and a concave portion 1122 in a vicinity of theperiphery of the first lens element 110.

An example embodiment of the second lens element 120 may have negativerefracting power. The object-side surface 121 may comprise a convexportion 1211 in a vicinity of the optical axis and a convex portion 1212in a vicinity of a periphery of the second lens element 120. Theimage-side surface 122 may comprise a concave portion 1221 in a vicinityof the optical axis and a concave portion 1222 in a vicinity of theperiphery of the second lens element 120.

An example embodiment of the third lens element 130 may have positiverefracting power. The object-side surface 131 may comprise a convexportion 1311 in a vicinity of the optical axis and a convex portion 1312in a vicinity of a periphery of the third lens element 130. Theimage-side surface 132 may comprise a convex portion 1321 in a vicinityof the optical axis and a convex portion 1322 in a vicinity of theperiphery of the third lens element 130.

An example embodiment of the fourth lens element 140 may have negativerefracting power. The object-side surface 141 may comprise a concaveportion 1411 in a vicinity of the optical axis and a concave portion1412 in a vicinity of a periphery of the fourth lens element 140. Theimage-side surface 142 may comprise a concave portion 1421 in a vicinityof the optical axis and a concave portion 1422 in a vicinity of theperiphery of the fourth lens element 140.

An example embodiment of the fifth lens element 150 may have positiverefracting power. The object-side surface 151 may comprise a convexportion 1511 in a vicinity of the optical axis and a concave portion1512 in a vicinity of a periphery of the fifth lens element 150. Theimage-side surface 152 may comprise a concave portion 1521 in a vicinityof the optical axis and a convex portion 1522 in a vicinity of theperiphery of the fifth lens element 150.

The aspherical surfaces including the object-side surface 111 of thefirst lens element 110, the image-side surface 112 of the first lenselement 110, the object-side surface 121 and the image-side surface 122of the second lens element 120, the object-side surface 131 and theimage-side surface 132 of the third lens element 130, the object-sidesurface 141 and the image-side surface 142 of the fourth lens element140, the object-side surface 151 and the image-side surface 152 of thefifth lens element 150 may all be defined by the following asphericalformula (1):

$\begin{matrix}{{Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{i} \times Y^{i}}}}} & {{formula}(1)}\end{matrix}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant; and

a_(i) represents an aspherical coefficient of i^(th) level.

The values of each aspherical parameter are shown in FIG. 9 .

FIG. 7(a) shows the longitudinal spherical aberration, wherein thehorizontal axis of FIG. 7(a) defines the focus, and the vertical axis ofFIG. 7(a) defines the field of view. FIG. 7(b) shows the astigmatismaberration in the sagittal direction, wherein the horizontal axis ofFIG. 7(b) defines the focus, and the vertical axis of FIG. 7(b) definesthe image height. FIG. 7(c) shows the astigmatism aberration in thetangential direction, wherein the horizontal axis of FIG. 7(c) definesthe focus, and the vertical axis of FIG. 7(c) defines the image height.FIG. 7(d) shows the variation of the distortion aberration, wherein thehorizontal axis of FIG. 7(d) defines the percentage, and the verticalaxis of FIG. 7(d) defines the image height. The three curves withdifferent wavelengths (about 470 nm, about 555 nm, about 650 nm)represent that off-axis light with respect to these wavelengths may befocused around an image point. From the vertical deviation of each curveshown in FIG. 7(a), the offset of the off-axis light relative to theimage point may be within about ±0.08 mm. Therefore, the firstembodiment may improve the longitudinal spherical aberration withrespect to different wavelengths. Referring to FIG. 7(b), the focusvariation with respect to the three different wavelengths (about 470 nm,about 555 nm, about 650 nm) in the whole field may fall within about±0.2 mm. Referring to FIG. 7(c), the focus variation with respect to thethree different wavelengths (about 470 nm, about 555 nm, about 650 nm)in the whole field may fall within about ±0.5 mm. Referring to FIG.7(d), the horizontal axis of FIG. 7(d), the variation of the distortionaberration may be within about +12%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referenced in FIG. 46 .

The distance from the object-side surface 111 of the first lens element110 to the image plane 170 along the optical axis (TTL) may be about9.147 mm, Fno may be about 2.390 (the size of aperture decreases whileFno increases), HFOV may be about 14.90 degrees. When the value of Fnois smaller, the size of the aperture stop and the amounts of lightentering into the optical imaging lens may be larger. In accordance withthese values, the present embodiment may provide an optical imaging lenshaving a shortened length while maintaining more advantageous amounts oflight entering into the optical imaging lens.

Reference is now made to FIGS. 10-13 . FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 having five lenselements according to a second example embodiment. FIG. 11 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 2 according to the secondexample embodiment. FIG. 12 shows an example table of optical data ofeach lens element of the optical imaging lens 2 according to the secondexample embodiment. FIG. 13 shows an example table of aspherical data ofthe optical imaging lens 2 according to the second example embodiment.The reference numbers labeled in the present embodiment may be similarto those in the first embodiment for the similar elements, but here thereference numbers are initialed with 2, for example, reference number231 for labeling the object-side surface of the third lens element 230,reference number 232 for labeling the image-side surface of the thirdlens element 230, etc.

As shown in FIG. 10 , the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 210, a second lenselement 220, an aperture stop 200, a third lens element 230, a fourthlens element 240, and a fifth lens element 250.

The arrangements of convex or concave surface structures including theobject-side surfaces 211, 221, 231, 241, 251 and the image-side surfaces212, 222, 242 may be generally similar to the optical imaging lens 1,but the differences between the optical imaging lens 1 and the opticalimaging lens 2 may include the convex or concave surface of image-sidesurfaces 232 and 252 being different from the optical imaging lens 1.Additional differences may include a radius of curvature, a thickness,an aspherical data, and an effective focal length of each lens element.More specifically, the image-side surface 232 of the third lens element230 may comprise a concave portion 2321 in a vicinity of the opticalaxis, the image-side surface 252 of the fifth lens element 250 maycomprise a convex portion 2521 in a vicinity of the optical axis.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. Please refer to FIG. 12 for theoptical characteristics of each lens element in the optical imaging lens2 of the present embodiment.

From the vertical deviation of each curve shown in FIG. 11(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.45 mm. Referring to FIG. 11(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.45 mm.Referring to FIG. 11(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.35 mm. Referring to FIG. 11(d), thevariation of the distortion aberration of the optical imaging lens 2 maybe within about ±5%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the astigmatism aberration inthe tangential direction may be smaller, Fno may be the same but TTL maybe smaller. Further, the difference between the thickness in a vicinityof the optical axis and the thickness in a vicinity of a peripheryregion may be smaller when compared to the first embodiment, so thatthis embodiment may be manufactured more easily and the yield rate maybe higher when compared to the first embodiment.

Reference is now made to FIGS. 14-17 . FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 having five lenselements according to a third example embodiment. FIG. 15 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 3 according to the third exampleembodiment. FIG. 16 shows an example table of optical data of each lenselement of the optical imaging lens 3 according to the third exampleembodiment. FIG. 17 shows an example table of aspherical data of theoptical imaging lens 3 according to the third example embodiment. Thereference numbers labeled in the present embodiment may be similar tothose in the first embodiment for the similar elements, but here thereference numbers are initialed with 3, for example, reference number331 for labeling the object-side surface of the third lens element 330,reference number 332 for labeling the image-side surface of the thirdlens element 330, etc.

As shown in FIG. 14 , the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 310, a second lenselement 320, an aperture stop 300, a third lens element 330, a fourthlens element 340, and a fifth lens element 350.

The arrangements of the convex or concave surface structures, includingthe object-side surfaces 311, 321, 331, 341, 351 and the image-sidesurfaces 312, 322, 332 may be generally similar to the optical imaginglens 1, but the differences between the optical imaging lens 1 and theoptical imaging lens 3 may include the convex or concave surfacestructure of the image-side surfaces 342 and 352 being different.Additional differences may include a radius of curvature, a thickness,aspherical data, and an effective focal length of each lens element.More specifically, the image-side surface 342 of the fourth lens element340 may comprise a convex portion 3421 in a vicinity of the opticalaxis, and the image-side surface 352 of the fifth lens element 350 maycomprise a convex portion 3521 in a vicinity of the optical axis.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. Please refer to FIG. 16 for theoptical characteristics of each lens element in the optical imaging lens3 of the present embodiment.

From the vertical deviation of each curve shown in FIG. 15(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.14 mm. Referring to FIG. 15(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.14 mm.Referring to FIG. 15(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.14 mm. Referring to FIG. 15(d), thevariation of the distortion aberration of the optical imaging lens 3 maybe within about ±0.3%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the astigmatism aberrations inthe sagittal direction and in the tangential direction may be smaller,the variation of the distortion aberration may be smaller, and Fno maybe the same. Further, the difference between the thickness in a vicinityof the optical axis and the thickness in a vicinity of a peripheryregion may be smaller when compared to the first embodiment, so thatthis embodiment may be manufactured more easily and the yield rate maybe higher when compared to the first embodiment.

Reference is now made to FIGS. 18-21 . FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 having five lenselements according to a fourth example embodiment. FIG. 19 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 4 according to the fourthembodiment. FIG. 20 shows an example table of optical data of each lenselement of the optical imaging lens 4 according to the fourth exampleembodiment. FIG. 21 shows an example table of aspherical data of theoptical imaging lens 4 according to the fourth example embodiment. Thereference numbers labeled in the present embodiment may be similar tothose in the first embodiment for the similar elements, but here thereference numbers are initialed with 4, for example, reference number431 for labeling the object-side surface of the third lens element 430,reference number 432 for labeling the image-side surface of the thirdlens element 430, etc.

As shown in FIG. 18 , the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 410, a second lenselement 420, an aperture stop 400, a third lens element 430, a fourthlens element 440, and a fifth lens element 450.

The arrangements of the convex or concave surface structures, includingthe object-side surfaces 411, 421, 431, 441, 451 and the image-sidesurfaces 412, 422, 432, 442, 452 may be generally similar to the opticalimaging lens 1, but additional differences may include a radius ofcurvature, a thickness, aspherical data, and an effective focal lengthof each lens element being different.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. Please refer to FIG. 20 for theoptical characteristics of each lens elements in the optical imaginglens 4 of the present embodiment.

From the vertical deviation of each curve shown in FIG. 19(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.06 mm. Referring to FIG. 19(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.05 mm.Referring to FIG. 19(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.08 mm. Referring to FIG. 19(d), thevariation of the distortion aberration of the optical imaging lens 4 maybe within about ±1.6%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the longitudinal sphericalaberration may be smaller, the astigmatism aberrations in the sagittaldirection and in the tangential direction may be smaller, the variationof the distortion aberration may be smaller, Fno may be the same.Further, the difference between the thickness in a vicinity of theoptical axis and the thickness in a vicinity of a periphery region maybe smaller when compared to the first embodiment, so that thisembodiment may be manufactured more easily and the yield rate may behigher when compared to the first embodiment.

Reference is now made to FIGS. 22-25 . FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 having five lenselements according to a fifth example embodiment. FIG. 23 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 5 according to the fifthembodiment. FIG. 24 shows an example table of optical data of each lenselement of the optical imaging lens 5 according to the fifth exampleembodiment. FIG. 25 shows an example table of aspherical data of theoptical imaging lens 5 according to the fifth example embodiment. Thereference numbers labeled in the present embodiment may be similar tothose in the first embodiment for the similar elements, but here thereference numbers are initialed with 5, for example, reference number531 for labeling the object-side surface of the third lens element 530,reference number 532 for labeling the image-side surface of the thirdlens element 530, etc.

As shown in FIG. 22 , the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 510, a second lenselement 520, an aperture stop 500, a third lens element 530, a fourthlens element 540, and a fifth lens element 550.

The arrangements of the convex or concave surface structures, includingthe object-side surfaces 511, 521, 531, 541 and the image-side surfaces512, 522, 542, 552 may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 5 may include the convex or concave surfacestructure of the object-side surface 551 and image-side surface 532being different. Additional differences may include a radius ofcurvature, a thickness, aspherical data, and an effective focal lengthof each lens element. More specifically, the image-side surface 532 ofthe third lens element 530 may include a concave portion 5321 in avicinity of the optical axis, and the object-side surface 551 of thefifth lens element 550 may comprise a convex portion 5512 in a vicinityof a periphery of the fifth lens element 550.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. FIG. 24 depicts the opticalcharacteristics of each lens elements in the optical imaging lens 5 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 23(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.016 mm. Referring to FIG. 23(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.01 mm.Referring to FIG. 23(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.05 mm. Referring to FIG. 23(d), thevariation of the distortion aberration of the optical imaging lens 5 maybe within about ±0.35%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the longitudinal sphericalaberration may be smaller, the astigmatism aberrations in the sagittaldirection and in the tangential direction may be smaller, the variationof the distortion aberration may be smaller, Fno may be the same.Further, the difference between the thickness in a vicinity of theoptical axis and the thickness in a vicinity of a periphery region maybe smaller when compared to the first embodiment, so that thisembodiment may be manufactured more easily and the yield rate may behigher when compared to the first embodiment.

Reference is now made to FIGS. 26-29 . FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having five lenselements according to a sixth example embodiment. FIG. 27 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 6 according to the sixthembodiment. FIG. 28 shows an example table of optical data of each lenselement of the optical imaging lens 6 according to the sixth exampleembodiment. FIG. 29 shows an example table of aspherical data of theoptical imaging lens 6 according to the sixth example embodiment. Thereference numbers labeled in the present embodiment may be similar tothose in the first embodiment for the similar elements, but here thereference numbers are initialed with 6, for example, reference number631 for labeling the object-side surface of the third lens element 630,reference number 632 for labeling the image-side surface of the thirdlens element 630, etc.

As shown in FIG. 26 , the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 610, a second lenselement 620, an aperture stop 600, a third lens element 630, a fourthlens element 640, and a fifth lens element 650.

The arrangements of the convex or concave surface structures, includingthe object-side surfaces 611, 621, 631, 641 and the image-side surfaces612, 622, 632 642, 652 may be generally similar to the optical imaginglens 1, but the differences between the optical imaging lens 1 and theoptical imaging lens 6 may include the convex or concave surfacestructures of the object-side surface 651 being different. Additionaldifferences may include a radius of curvature, a thickness, asphericaldata, and an effective focal length of each lens element. Morespecifically, the object-side surface 651 of the fifth lens element 650may comprise a convex portion 6512 in a vicinity of a periphery of thefifth lens element 650.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. Please refer to FIG. 28 for theoptical characteristics of each lens elements in the optical imaginglens 6 of the present embodiment.

From the vertical deviation of each curve shown in FIG. 27(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.02 mm. Referring to FIG. 27(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.25 mm.Referring to FIG. 23(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.35 mm. Referring to FIG. 27(d), thevariation of the distortion aberration of the optical imaging lens 6 maybe within about ±5%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the longitudinal sphericalaberration may be smaller, the astigmatism aberration in the tangentialdirection may be smaller, the variation of the distortion aberration maybe smaller, Fno may be the same but TTL may be smaller. Further, thedifference between the thickness in a vicinity of the optical axis andthe thickness in a vicinity of a periphery region may be smaller whencompared to the first embodiment, so that this embodiment may bemanufactured more easily and the yield rate may be higher when comparedto the first embodiment.

Reference is now made to FIGS. 30-33 . FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having five lenselements according to a seventh example embodiment. FIG. 31 showsexample charts of longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 7 according to theseventh embodiment. FIG. 32 shows an example table of optical data ofeach lens element of the optical imaging lens 7 according to the seventhexample embodiment. FIG. 33 shows an example table of aspherical data ofthe optical imaging lens 7 according to the seventh example embodiment.The reference numbers labeled in the present embodiment may be similarto those in the first embodiment for the similar elements, but here thereference numbers are initialed with 7, for example, reference number731 for labeling the object-side surface of the third lens element 730,reference number 732 for labeling the image-side surface of the thirdlens element 730, etc.

As shown in FIG. 30 , the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 710, a second lenselement 720, an aperture stop 700, a third lens element 730, fourth lenselement 740, and a fifth lens element 750.

The arrangements of the convex or concave surface structures, includingthe object-side surfaces 711, 721, 731, 741, 751 and the image-sidesurfaces 712, 722, 732, 742, 752 may be generally similar to the opticalimaging lens 1, but additional differences may include a radius ofcurvature, a thickness, aspherical data, and an effective focal lengthof each lens element being different.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. Please refer to FIG. 32 for theoptical characteristics of each lens elements in the optical imaginglens 7 of the present embodiment.

From the vertical deviation of each curve shown in FIG. 31(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.045 mm. Referring to FIG. 31(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.06 mm.Referring to FIG. 31(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.04 mm. Referring to FIG. 31(d), thevariation of the distortion aberration of the optical imaging lens 7 maybe within about ±1.2%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the longitudinal sphericalaberration may be smaller, the astigmatism aberration in the tangentialdirection may be smaller, the variation of the distortion aberration maybe smaller, and Fno may be the same. Further, the difference between thethickness in a vicinity of the optical axis and the thickness in avicinity of a periphery region may be smaller when compared to the firstembodiment, so that this embodiment may be manufactured more easily andthe yield rate may be higher when compared to the first embodiment.

Reference is now made to FIGS. 34-37 . FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having five lenselements according to an eighth example embodiment. FIG. 35 showsexample charts of longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 8 according to theeighth embodiment. FIG. 36 shows an example table of optical data ofeach lens element of the optical imaging lens 8 according to the eighthexample embodiment. FIG. 37 shows an example table of aspherical data ofthe optical imaging lens 8 according to the eighth example embodiment.The reference numbers labeled in the present embodiment may be similarto those in the first embodiment for the similar elements, but here thereference numbers are initialed with 8, for example, reference number831 for labeling the object-side surface of the third lens element 830,reference number 832 for labeling the image-side surface of the thirdlens element 830, etc.

As shown in FIG. 34 , the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 810, a second lenselement 820, an aperture stop 800, a third lens element 830, a fourthlens element 840, and a fifth lens element 850.

The arrangements of the convex or concave surface structures, includingthe object-side surfaces 811, 821, 831, 841, 851 and the image-sidesurfaces 812, 822, 842, and 852 may be generally similar to the opticalimaging lens 1, but the differences between the optical imaging lens 1and the optical imaging lens 8 may include the convex or concave surfacestructures of the image-side surface 832 being different. Additionaldifferences may include a radius of curvature, a thickness, asphericaldata, and an effective focal length of each lens element. Morespecifically, the image-side surface 832 of the third lens element 830may comprise a concave portion 8321 in a vicinity of the optical axisand a concave portion 8322 in a vicinity of a periphery of the thirdlens element 830.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. Please refer to FIG. 36 for theoptical characteristics of each lens elements in the optical imaginglens 8 of the present embodiment.

From the vertical deviation of each curve shown in FIG. 35(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.016 mm. Referring to FIG. 35(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.02 mm.Referring to FIG. 35(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.03 mm. Referring to FIG. 35(d), thevariation of the distortion aberration of the optical imaging lens 8 maybe within about ±6%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the longitudinal sphericalaberration may be smaller, the astigmatism aberrations in the sagittaldirection and in the tangential direction may be smaller, the variationof the distortion aberration may be smaller, and Fno may be the same.Further, the difference between the thickness in a vicinity of theoptical axis and the thickness in a vicinity of a periphery region maybe smaller when compared to the first embodiment, so that thisembodiment may be manufactured more easily and the yield rate may behigher when compared to the first embodiment.

Reference is now made to FIGS. 38-41 . FIG. 38 illustrates an examplecross-sectional view of an optical imaging lens 9 having five lenselements according to a ninth example embodiment. FIG. 39 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 9 according to the ninthembodiment. FIG. 40 shows an example table of optical data of each lenselement of the optical imaging lens 9 according to the ninth exampleembodiment. FIG. 41 shows an example table of aspherical data of theoptical imaging lens 9 according to the ninth example embodiment. Thereference numbers labeled in the present embodiment may be similar tothose in the first embodiment for the similar elements, but here thereference numbers are initialed with 9, for example, reference number931 for labeling the object-side surface of the third lens element 930,reference number 932 for labeling the image-side surface of the thirdlens element 930, etc.

As shown in FIG. 38 , the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 910, a second lenselement 920, an aperture stop 900, a third lens element 930, a fourthlens element 940, and a fifth lens element 950.

The arrangements of the convex or concave surface structures, includingthe object-side surfaces 911, 921, 931, 941, 951 and the image-sidesurfaces 912, 922, 932, 952 may be generally similar to the opticalimaging lens 1, but the differences between the optical imaging lens 1and the optical imaging lens 9 may include the convex or concave surfacestructures of the image-side surface 942 being different. Additionaldifferences may include a radius of curvature, a thickness, asphericaldata, and an effective focal length of each lens element. Morespecifically, the image-side surface 942 of the fourth lens element 940may comprise a convex portion 9421 in a vicinity of the optical axis.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. Please refer to FIG. 40 for theoptical characteristics of each lens elements in the optical imaginglens 9 of the present embodiment.

From the vertical deviation of each curve shown in FIG. 39(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.06 mm. Referring to FIG. 39(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.08 mm.Referring to FIG. 39(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.06 mm. Referring to FIG. 39(d), thevariation of the distortion aberration of the optical imaging lens 9 maybe within about ±0.8%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the longitudinal sphericalaberration may be smaller, the astigmatism aberrations in the sagittaldirection and in the tangential direction may be smaller, the variationof the distortion aberration may be smaller, and Fno may be the same.Further, the difference between the thickness in a vicinity of theoptical axis and the thickness in a vicinity of a periphery region maybe smaller when compared to the first embodiment, so that thisembodiment may be manufactured more easily and the yield rate may behigher when compared to the first embodiment.

Reference is now made to FIGS. 42-45 . FIG. 42 illustrates an examplecross-sectional view of an optical imaging lens 10′ having five lenselements according to a tenth example embodiment. FIG. 43 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 10′ according to the tenthembodiment. FIG. 44 shows an example table of optical data of each lenselement of the optical imaging lens 10′ according to the tenth exampleembodiment. FIG. 45 shows an example table of aspherical data of theoptical imaging lens 10′ according to the tenth example embodiment. Thereference numbers labeled in the present embodiment are similar to thosein the first embodiment for the similar elements, but here the referencenumbers are initialed with 10′, for example, reference number 10′31 forlabeling the object-side surface of the third lens element 10′30,reference number 10′32 for labeling the image-side surface of the thirdlens element 10′30, etc.

As shown in FIG. 42 , the optical imaging lens 10′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element 10′10, an aperturestop 10′00, a second lens element 10′20, a third lens element 10′30, afourth lens element 10′40, and a fifth lens element 10′50.

The arrangements of the convex or concave surface structures, includingthe object-side surfaces 10′11, 10′21, 10′31, 10′41, 10′51 and theimage-side surfaces 10′12, 10′22, 10′32, 10′42, 10′52 may be generallysimilar to the optical imaging lens 1, but the differences between theoptical imaging lens 1 and the optical imaging lens 10 may include thelocation of the aperture stop 10′00 being different. Additionaldifferences may include a radius of curvature, a thickness, asphericaldata, and an effective focal length of each lens element.

Here, in the interest of clearly showing the drawings of a particularembodiment, only the surface shapes which may be different from that inthe first embodiment are labeled. Please refer to FIG. 44 for theoptical characteristics of each lens elements in the optical imaginglens 10′ of the present embodiment.

From the vertical deviation of each curve shown in FIG. 43(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.02 mm. Referring to FIG. 43(b), the focus variation withrespect to the three different wavelengths (about 470 nm, about 555 nm,about 650 nm) in the whole field may fall within about ±0.03 mm.Referring to FIG. 43(c), the focus variation with respect to the threedifferent wavelengths (about 470 nm, about 555 nm, about 650 nm) in thewhole field may fall within about ±0.05 mm. Referring to FIG. 43(d), thevariation of the distortion aberration of the optical imaging lens 10′may be within about ±1.2%.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of this embodiment may be referred to FIG. 46 .

In comparison with the first embodiment, the longitudinal sphericalaberration may be smaller, the astigmatism aberrations in the sagittaldirection and in the tangential direction may be smaller, the variationof the distortion aberration may be smaller, Fno may be bigger but isstill smaller than 2.6. Further, the difference between the thickness ina vicinity of the optical axis and the thickness in a vicinity of aperiphery region may be smaller when compared to the first embodiment,so that this embodiment may be manufactured more easily and the yieldrate may be higher when compared to the first embodiment.

The values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G5, TF, GFP, BFL,ALT,AAG,TTL,TL,EFL/ALT,EFL/BFL,TTL/BFL,TTL/ALT,ALT/(T1+T3+T4),(T2+G23+G34+G45+T5)/T1,(T2+G23+G34+G45+T5)/T3,(G12+T2+G45+T5)/T1,(G12+T2+G45+T5)/T3,(AAG+T5)/T1, (AAG+T5)/(T2+G23), (AAG+T2)/T4, (AAG+T2)/T5, AAG/T2, AAG/G23,AAG/T4 of all embodiment may be referred to FIG. 46 , and it is clearthat the optical imaging lens of any one of the ten embodiments maysatisfy the Inequalities (1) to (17).

The first lens element having positive refracting power may assist inconverging lights. The image-side surface of the first lens elementhaving a concave portion in a vicinity of the optical axis and a concaveportion in a vicinity of a periphery region of the first lens elementmay assist in matching with the object-side surface of the second lenselement having a convex portion in a vicinity of a periphery region ofthe second lens element for decreasing the longitudinal sphericalaberration. Moreover, the longitudinal spherical aberration may besmaller if the object-side surface of the second lens element comprisesa convex portion in a vicinity of the optical axis. The object-sidesurface of the third lens element having a convex portion in a vicinityof the periphery region of the third lens element or having positiverefracting power may assist in decreasing the aberration caused by thefirst and second lens elements, and the aberration may be smaller if theimage-side surface of the third lens element comprises a convex portionin a vicinity of a periphery region of the third lens element. Theimage-side surface of the fourth lens element having a concave portionin a vicinity of a periphery region of the fourth lens element mayassist in decreasing the aberration caused by the third lens element,and the aberration may be smaller if the fourth lens element hasnegative refracting power. The image-side surface of the fifth lenselement having a convex portion in a periphery region of the fifth lenselement may assist in decreasing the aberration caused by the fourthlens element. The object-side surface and image-side surface of thefifth lens element being aspherical surfaces may assist in decreasingthe aberration of the optical imaging lens.

The effective radius of each lens element may be smaller or equal toabout 2.5 mm, and the focal length of the optical imaging lens may bebetween about 8 mm and about 13.5 mm. In some embodiments, the effectiveradius may be smaller or equal to about 2 mm and the focal length may bebetween about 9 mm and about 13.5 mm. Such ranges may be advantageous toincrease the focal length while conforming to a smaller lens volume of amobile electrical device.

As a result of the aperture stop being located between the first lenselement and the third lens element, the effective radius of each lenselement may not be increased beyond about 2.5 mm and the focal lengthmay be maintained between about 8 mm and about 13.5 mm when Fno isdecreased. In some embodiments, the aperture stop may advantageously belocated between the second lens element and the third lens element. Insuch embodiments, Fno may be smaller than about 2.4, the effectiveradius may be smaller or equal to about 2 mm and the focal length may bebetween about 9 mm and about 13.5 mm.

When v5≤35.00, the chromatic aberration caused by the fourth lenselement and the chromatic aberration of the optical imaging lens can beregulated. An advantageous range of the Abbe number of the fifth lenselement may be between about 18 and about 35.

When the value of any one of optical parameters is too big, it may notbe advantageous to revise the aberration of the optical imaging lens.When the value of any one of optical parameters is too small, it may bedifficult to manufacture the optical imaging lens. For maintainingappropriate values of the focal length and other optical parameters, theoptical imaging lens may satisfy any one of inequalities as follows:EFL/ALT≤2.4, and a more advantageous range is “1.5 EFL/ALT≤2.4”; andEFL/BFL≤4.2, and a more advantageous range is “1.8≤EFL/BFL≤4.2.”

When the value of any one of optical parameters is too big, it may notbe advantageous to decrease the volume of the optical imaging lens. Whenthe value of any one of optical parameters is too small, it may bedifficult to manufacture the optical imaging lens. For maintainingappropriate values of the thickness of each lens element and the gap,the optical imaging lens may satisfy any one of inequalities as follows:

TTL/BFL≤3.61, and a more advantageous range is “1.45≤TTL/BFL≤3.61”;TTL/ALT≤2.21, and a more advantageous range is “1.2≤TTL/ALT≤2.21;”ALT/(T1+T3+T4)≤1.8, and a more advantageous range is “0.8ALT/(T1+T3+T4)≤1.8;”(T2+G23+G34+G45+T5)/T1≤3.3, and a more advantageous range is

“1.2≤(T2+G23+G34+G45+T5)/T1≤3.3;”

(T2+G23+G34+G45+T5)/T3≤6, and a more advantageous range is

“1≤(T2+G23+G34+G45+T5)/T3≤6;”

(G12+T2+G45+T5)/T1≤2.2, and a more advantageous range is

“0.7≤(G12+T2+G45+T5)/T1≤2.2;”

(G12+T2+G45+T5)/T3≤4.1, and a more advantageous range is

“0.69≤(G12+T2+G45+T5)/T3≤4.1;”

(AAG+T5)/T1≤3.01, and a more advantageous range is “1≤(AAG+T5)/T1≤3.01;”(AAG+T5)/(T2+G23)≤4.2, and a more advantageous range is

“1.49≤(AAG+T5)/(T2+G23)≤4.2;”

(AAG+T2)/T4≤8.51, and a more advantageous range is“1.4≤(AAG+T2)/T4≤8.51;”(AAG+T2)/T5≤4.6, and a more advantageous range is“0.79≤(AAG+T2)/T5≤4.6;”AAG/T2≤4.71, and a more advantageous range is “1.94≤AAG/T2≤4.71;”AAG/G23≤4, and a more advantageous range is “1.1≤AAG/G23≤4;” andAAG/T4≤7.2, and a more advantageous range is “0.99≤AAG/T4≤7.2.”

Moreover, the optical parameters according to one embodiment may beselectively incorporated in other embodiments to limit and enhance thestructure of the optical imaging lens. In consideration of thenon-predictability of the optical imaging lens, while the opticalimaging lens may satisfy any one of inequalities described above, theoptical imaging lens herein may advantageously achieve a shortenedlength, provide an enlarged aperture stop, increase an imaging qualityand/or assembly yield, and/or effectively improve drawbacks of a typicaloptical imaging lens.

Any one of the aforementioned inequalities may be selectivelyincorporated in other inequalities to apply to the present embodiments,and as such are not limiting. Embodiments according to the presentdisclosure are not limiting and may be selectively incorporated in otherembodiments described herein. In some embodiments, more details aboutthe parameters may be incorporated to enhance the control for the systemperformance and/or resolution. For example, the object-side surface ofthe first lens element may comprise a convex portion in a vicinity ofthe optical axis. It is noted that the details listed here may beincorporated into example embodiments if no inconsistency occurs.

While various embodiments in accordance with the disclosed principlesbeen described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features may be provided indescribed embodiments, but shall not limit the application of suchissued claims to processes and structures accomplishing any or all ofthe above advantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, comprising first,second, third, fourth, and fifth lens elements as five frontmost lenselements arranged sequentially in ascending order from an object side toan image side along an optical axis, an object-side surface facingtoward the object side, an image-side surface facing toward the imageside, wherein: the image-side surface of the first lens elementcomprises a concave portion in a vicinity of the optical axis; theobject-side surface of the second lens element comprises a convexportion in a vicinity of a periphery of the second lens element; theimage-side surface of the second lens element comprises a concaveportion in a vicinity of a periphery of the second lens element; theobject-side surface of the fifth lens element comprises a convex portionin a vicinity of the optical axis; a sum of all air gaps from the firstlens element to the fifth lens element along the optical axis isrepresented by AAG; a central thickness of the fifth lens element alongthe optical axis is represented by T5; a central thickness of the firstlens element along the optical axis is represented by T1; a centralthickness of the second lens element along the optical axis isrepresented by T2; a distance from the object-side surface of the firstlens element to an image plane along the optical axis is represented byTTL; a distance from the image-side surface of the fifth lens element tothe image plane along the optical axis is represented by BFL; and theoptical imaging lens further satisfies inequalities: (AAG+T5)/T1≤3.01,AAG/T2≤4.71 and TTL/BFL≤3.61.
 2. The optical imaging lens according toclaim 1, wherein a sum of central thicknesses from the first to thefifth lens elements along the optical axis is represented by ALT, acentral thickness of the third lens element along the optical axis isrepresented by T3, a central thickness of the fourth lens element alongthe optical axis is represented by T4, and the optical imaging lensfurther satisfies an inequality: ALT/(T1+T3+T4)≤1.8.
 3. The opticalimaging lens according to claim 1, wherein an air gap between the secondlens element and the third lens element along the optical axis isrepresented by G23, and the optical imaging lens further satisfies aninequality: (AAG+T5)/(T2+G23)≤4.2.
 4. The optical imaging lens accordingto claim 1, wherein an air gap between the second lens element and thethird lens element along the optical axis is represented by G23, an airgap between the third lens element and the fourth lens element along theoptical axis is represented by G34, an air gap between the fourth lenselement and the fifth lens element along the optical axis is representedby G45, and the optical imaging lens further satisfies an inequality:(T2+G23+G34+G45+T5)/T1≤3.3.
 5. The optical imaging lens according toclaim 1, wherein a central thickness of the fourth lens element alongthe optical axis is represented by T4, and the optical imaging lensfurther satisfies an inequality: (AAG+T2)/T4≤8.51.
 6. The opticalimaging lens according to claim 1, wherein the object-side surface ofthe third lens element comprises a convex portion in a vicinity of aperiphery of the third lens element.
 7. The optical imaging lensaccording to claim 1, wherein the image-side surface of the fifth lenselement comprises a concave portion in a vicinity of the optical axis.8. An optical imaging lens, comprising first, second, third, fourth, andfifth lens elements as five frontmost lens elements arrangedsequentially in ascending order from an object side to an image sidealong an optical axis, an object-side surface facing toward the objectside, an image-side surface facing toward the image side, wherein: theimage-side surface of the first lens element comprises a concave portionin a vicinity of the optical axis; the second lens element has negativerefracting power; the object-side surface of the fifth lens elementcomprises a convex portion in a vicinity of the optical axis; a sum ofall air gaps from the first lens element to the fifth lens element alongthe optical axis is represented by AAG; a central thickness of the fifthlens element along the optical axis is represented by T5; a centralthickness of the first lens element along the optical axis isrepresented by T1; a central thickness of the second lens element alongthe optical axis is represented by T2; a distance from the object-sidesurface of the first lens element to an image plane along the opticalaxis is represented by TTL; a distance from the image-side surface ofthe fifth lens element to the image plane along the optical axis isrepresented by BFL; and the optical imaging lens further satisfiesinequalities: (AAG+T5)/T1≤3.01, AAG/T2≤4.71 and TTL/BFL≤3.61.
 9. Theoptical imaging lens according to claim 8, wherein an effective focallength of the optical imaging lens is represented by EFL, and theoptical imaging lens further satisfies an inequality: EFL/BFL≤4.2. 10.The optical imaging lens according to claim 8, wherein a centralthickness of the fourth lens element along the optical axis isrepresented by T4, the optical imaging lens further satisfies aninequality: AAG/T4≤7.2.
 11. The optical imaging lens according to claim8, wherein an air gap between the first lens element and the second lenselement along the optical axis is represented by G12, an air gap betweenthe fourth lens element and the fifth lens element along the opticalaxis is represented by G45, and the optical imaging lens furthersatisfies an inequality: (G12+T2+G45+T5)/T1≤2.2.
 12. The optical imaginglens according to claim 8, wherein the first lens element has positiverefracting power, the third lens element has positive refracting power,the fourth lens element has negative refracting power, and the fifthlens element has positive refracting power.
 13. The optical imaging lensaccording to claim 8, wherein the object-side surface of the third lenselement comprises a convex portion in a vicinity of the optical axis.14. The optical imaging lens according to claim 8, wherein theobject-side surface of the fourth lens element comprises a concaveportion in a vicinity of the optical axis.
 15. An optical imaging lens,comprising first, second, third, fourth, and fifth lens elements as fivefrontmost lens elements arranged sequentially in ascending order from anobject side to an image side along an optical axis, an object-sidesurface facing toward the object side, an image-side surface facingtoward the image side, wherein: the image-side surface of the first lenselement comprises a concave portion in a vicinity of the optical axis; asum of all air gaps from the first to the fifth lens elements along theoptical axis is represented by AAG; a central thickness of the fifthlens element along the optical axis is represented by T5; a centralthickness of the first lens element along the optical axis isrepresented by T1; an air gap between the second lens element and thethird lens element along the optical axis is represented by G23; theoptical imaging lens further satisfies inequalities: (AAG+T5)/T1≤3.01and AAG/G23≤4; and all of the first, second, third, fourth, and fifthlens elements have an effective radius smaller than or equal to 2.5 mm.16. The optical imaging lens according to claim 15, wherein a sum ofcentral thicknesses from the first to the fifth lens elements along theoptical axis is represented by ALT, a central thickness of the thirdlens element along the optical axis is represented by T3, a centralthickness of the fourth lens element along the optical axis isrepresented by T4, and the optical imaging lens further satisfies aninequality: ALT/(T1+T3+T4)≤1.8.
 17. The optical imaging lens accordingto claim 15, wherein a central thickness of the second lens elementalong the optical axis is represented by T2, and the optical imaginglens further satisfies an inequality: (AAG+T5)/(T2+G23)≤4.2.
 18. Theoptical imaging lens according to claim 15, wherein a central thicknessof the second lens element along the optical axis is represented by T2,an air gap between the third lens element and the fourth lens elementalong the optical axis is represented by G34, an air gap between thefourth lens element and the fifth lens element along the optical axis isrepresented by G45, and the optical imaging lens further satisfies aninequality: (T2+G23+G34+G45+T5)/T1≤3.3.
 19. The optical imaging lensaccording to claim 15, wherein an air gap between the first lens elementand the second lens element along the optical axis is represented byG12, a central thickness of the second lens element along the opticalaxis is represented by T2, an air gap between the fourth lens elementand the fifth lens element along the optical axis is represented by G45,a central thickness of the third lens element along the optical axis isrepresented by T3, and the optical imaging lens further satisfies aninequality: (G12+T2+G45+T5)/T3≤4.1.
 20. The optical imaging lensaccording to claim 15, wherein the object-side surface of the secondlens element comprises a convex portion in a vicinity of the opticalaxis.